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Long-Term Leases and Commitments - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Feb. 28, 2015
Clinton Cards [Member]  
Leases [Line Items]  
Estimated future minimum rental payments $ 326,000us-gaap_ContractualObligation
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= am_ClintonCardsMember
WHQ Development [Member]  
Leases [Line Items]  
Estimated future minimum rental payments $ 142,000us-gaap_ContractualObligation
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= am_WorldHeadQuartersDevelopmentMember